Yammer REST API: 401 Unauthorized when using Azure AD token and Yammer Delegated Permissions

Question

I am creating an Azure AD App that is using the new Yammer delegated permissions preview to post a message to Yammer using the access token that I obtained from Azure AD. Un

Answer 1

I have found the resolution for the problem. It appeared to be that Yammer authentication can be configured in 2 ways - one way is to configure it to use the same authentication as other parts of Office 365, and another one is to is using a different configuration.

If Yammer's own SSO is used (in other words, Yammer has a separaate configuration for ADFS), then this problem happens.If you disable Yammer SSO for your network, all yammer authentication for “mapped” users will be handled by Office365. When that’s done, you can then use the Office 365 API.